Passage 1.19.6
διαβᾶσι δὲ τὸν Ἰλισὸν χωρίον Ἄγραι καλούμενον καὶ ναὸς Ἀγροτέρας ἐστὶν Ἀρτέμιδος· ἐνταῦθα Ἄρτεμιν πρῶτον θηρεῦσαι λέγουσιν ἐλθοῦσαν ἐκ Δήλου, καὶ τὸ ἄγαλμα διὰ τοῦτο ἔχει τόξον. τὸ δὲ ἀκούσασι μὲν οὐχ ὁμοίως ἐπαγωγόν, θαῦμα δʼ ἰδοῦσι, στάδιόν ἐστι λευκοῦ λίθου. μέγεθος δὲ αὐτοῦ τῇδε ἄν τις μάλιστα τεκμαίροιτο· ἄνωθεν ὄρος ὑπὲρ τὸν Ἰλισὸν ἀρχόμενον ἐκ μηνοειδοῦς καθήκει τοῦ ποταμοῦ πρὸς τὴν ὄχθην εὐθύ τε καὶ διπλοῦν. τοῦτο ἀνὴρ Ἀθηναῖος Ἡρώδης ᾠκοδόμησε, καί οἱ τὸ πολὺ τῆς λιθοτομίας τῆς Πεντελῆσιν ἐς τὴν οἰκοδομὴν ἀνηλώθη.
Upon crossing the Ilisos, there is a place called Agrai and a temple of Artemis Agrotera (the Huntress). Here they say Artemis first hunted when she came from Delos; for this reason, the statue holds a bow. Close by is a stadium made of white marble, which, while not particularly impressive to hear about, is a marvel to behold. One may best judge its size as follows: above the Ilisos, a crescent-shaped hill slopes straight down, extending in a double form toward the riverbank. An Athenian named Herodes built it, and most of the marble from the quarries at Pentelicus was exhausted on this construction.